AVR-Chat

It looks like that on the STK200 the A15 (of ext. RAM interface = 
port C bit 7) is connected to /CE on 62256 socket (pin 20) so either 
an inverter is needed between the A15 and /CE on RAM socket, or 
the /CE has to be hardwired to GND (which is easier but also a trace 
on the PCB has to be cut). 

--- In AVR-Chat@yahoogroups.com, "mikkohelin" <mikko.helin@l...> 
wrote:
> How does the AVR (8515 etc.) access the external RAM, does it start 
> from address zero or is the byte @ 0x260 the lowest that can be 
> accessed on the chip physically (sounds logical as the internal RAM 
> is used below 260h and the address range ends at max. FFFFh)? So 
only 
> way to access the every bit on external RAM is to use max. 32 kB 
> (256kbit) RAM and address range 0x8000 -> 0xFFFF? 32 kB chips 
(62256 
> etc. on STK200) don't have A15 so it doesn't matter if it's zero or 
> one, right? In fact I'm trying to read and write AT29C256 (which 
the 
> new STK200 can do, don't know how). If anyone has already done this 
> it would be nice to borrow his/her wheel.